Cutter-head.



A. B. LANDIS.

CUTTER HEAD.

APPLICATION FILED MAR. 6, 1912.

Patented Feb. 9, 1915.

Z SHEETS-SHEET 1.

a wuemtocwi-tmaooeo A. B. LANDIS.

CUTTER HEAD.

APPLICATION FILED MAR. 6, 1912.

Patented Feb. 9, 1915.

2 SHEETS-SHEET 2.

4 provements ABRAHAM B;LAN'.DIS,'OF ENFIELD, PENNSYLVANIA.

CUTTER-HEAD.

Specification! of Letters Patent.

Patented 1 970.9, 1915;

Application filed March 6, 1912. Serial No. 681,873.

To all whom it may concern:

Be it known that I, ABRAHAM B. LANDIS, a citizen of the United States, residing at Enfield, Montgomery county, and State of Pennsylvania, have invented and dis covered'certain new and useful Improvements'in (hitter-Heads of which the following is a specification.

My said invention consists in certain imin' the construction and arrangement of parts of cutter-heads, whereby a conveniently and easily operated head for the purpose is provided and one wherein the die is rigidly supported, all as will-here inafter be more fully described and claimed.

Referring to the accompanying drawings, which are made a part hereof, and on which similar reference characters indicate similar parts, Figure 1 is a view chiefly in front elevation, showing a cutter-head embodying my said invention, Fig. 2 a View partly in cross section on the dotted line 2-2 in Fig. 1, Fig. 3 a detail section on the dotted line 3--3- in Fig. 2, Figs. 4, 5, 6 and 7, detail views illustrating separate parts V more clearly, and Fig. 8 a detail section on the dotted line 8 8 in Fig. 1.

In said drawings the portions marked A represent the body of the head, B an annular frame surrounding said body and C the cutter-holder.

The body A is a casting of suitable form and size adapted to be mounted on the spindle or'turret of the machine and formed with a central aperture surrounded by bearings for the {cutter -holder trunnions ar-' ranged equi-distant from the axis. The annular frame B surrounds said body'A and is secured thereto by screws 6 It is formed with radial sockets b in which are hollow cylinders 10, each of which has a'pinion ,11 formed-on its outer end. There are four is perforated longitudinally, the perforation being somewhat larger in diameter at its inner end than at its outer end, both sections being interiorly screw-threaded. A plug 12 is screwed into its inner end and is formed with a seat for the spherical head of a brace bar 13, interposed between said plug and an appropriate seat in the outer corner of the cutterholder in which a similarly formed opposite end of said brace bar rests. A screw-threaded shank-14 is mounted in the outer end of cylinder and has a head 15 of the form best shown in Fig. 5. One edge .of said head is formed with a notch 71. with which a pin 7) engages. Said pin is mounted in a perforation in the side of socket b and projects to the interior to make said engagement. The top of head 15 has a double inclined face, the portion 16 being of a sharp angle and the portion 17 of but a, slight angle. A ring 20 is mounted on frame B having a flange which extends through a slot in the adjacent side of said frame, said flange being formed with teeth on its inner edge which extend into mesh with the teeth of pinions 11 on the several cylinders 10. Said ring 20 is provided with a series of sockets s for the insertion of a handle (not shown) for rotating the same and with an annular groove in which 5 a ring 21 is mounted. Sliding bars 22 with double faced cams corresponding to the angles '16 and 17 ofhead 15, are attached to said ring 21 and adapted to slide l0ngi- The end of said tudinally with ring 21. bar has a. sharp angle 23 corresponding to the sharp angle 16 ofsaidhead'. A springmounted .detent 40 is mounted in a radial socket in ring 20, the inner end of which is adapted to engage with a conical depres sion 41in the frame B. Said detent serves to hold ring 20 with the parts in closed position, but when force isapplied to said ring, said detent will. yield by reason of the-taperedsides of the depression with which itengages, permitting the operation without undue resistance. As shown in Fig. 2, the inner. end of said detent bears upon the outer face of the depression with which it engages and the spring thus normally tends to hold the parts toward the front of the head and into operative engagement and also to keep the parts in close contact. 1 Ring 20 is formed with an annular groove 6 with which a shifting fork (not shown) engages foroperating the same. Ring B surrounds the "outer end of frame B covering the outer ends of sockets b and the grooves in which bars 22 slide, being secured to frame B by screws 50 in serted throughperforations in said ring into screw-threaded perforations in said rot frame at appropriately spaced intervals around the head.v

The cutter-holders C .are formed with trunnions C mounted in the journals in the body A and are supported at their outer ends by the braces 13, one end of which rests in the plug 12 and the other in. a suitable bearing in the inner end' of each of said cutter-holders, as before dc-'- scribed. A spring S (see Fig. 8) is mounted in a suitable recess in the body between the cutter-holder bearings and engages with each cutter-holder for normally holding it outward, as shown in several of my former patents, for example, No. 1,017,882, dated February 20, 1912.

The cutters C are mounted in recesses in the face of the cutter-holders C and are clamped at their outer edges by' means of inter-engaging tapered faces by a clamping" plate 25 having a cam face 26' adapted to bear against the inner tapered face of the cutter. Said clamping plate is operated by clamping screw 27 having a cone-shaped inner end which engages with the cone-shaped perforation 28 in said plates i The operation is as f llows:-'The parts. being. assembled as shown in Figs. 1 and 2,

the operation of cutting proceeds until the finishing cut on the work is made, when the movement longitudinally between ring 20 and the annular frame B, takes place, which slides bars 22 over heads 15 until the sharp angles strike each other when the springs are permitted'to turn the cutter-holderson their trunnions and open'the die. When it is desired to close the die, 20 isreturned to position which forces cylinders 10 in-. wardly and the cutter-holders into closed position. When it is desired to adjust the die for work .of different sizes,it. is done by turning ring 20 throughthe medium of a handle. inserted in a socket s therein, which operates through the gear connections with the cylinders 10 to rotate said cylinders and adjust them radiallyon the threaded shanks 14, as will be'n'eadily understood. By'turning the plugs 12independently of the cylinders 10 each of said bearings may be adjusted independent of the others, so as to secure a uniform adjustment of the several parts.

thus fully described .my said in vention what I claim as n ew an'ddesire to secure by Letters Patent, is: j

1. A cutter-head. comprising a body, cutter-holders pivoted around theaxis of said body," braces for supporting said cutter-holders in'relation'tothe rim of said body, and sliding cam faces for operating the braces radially for effecting the adjustment, substantially as set forth.

2. A cutter-head comprising a body, 'cut- '-ter-holders mounted on trunnions pivoted in bearings around the axis of said body, ra-

dially adjustable supports in the rim of said body, braces interposedbetween the outer corners of said cutter-holders and said sup-. ports, and cams for operating said braces" and supports radially to open and close the.

die, substantially as set forth. v

3, A cutter-head comprising a body, cutter-holders pivoted aroundthe axis of said body, a sliding ring on said body, rests-carried on said-body, braces interposed between said rests and said cutter-holders, and means for'moving said braces radially to open and close the die, substantially asset forth.

' 4. A cutter-head comprising a body, cutter-holders pivoted around the axisof said 'body, a sliding ring mounted on said body,

radially adjustable rests on said body, braces interposedbetween said rests and said outter-holders, and cams mounted to slide lon-' gitudinally of'said body for adjusting said rests radially, to open and close the die, substantially as set forth.

5. A cutter-head comprising a body, outter-holders pivoted around the axis ,of said body, means for normally turning said outter-holders on their pivots to open the die, a sliding ring surrounding said body, ra-

dial ly adjus table rests carried on said body,

braces interposed between said rests and said cutter-holders, sliding cams for operatsaidrests radially, and means for slid- 

